Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
Nonisolated
Compact, low profile surface mount package
Fixed frequency
High efficiency means less power dissipation
Excellent thermal performance
Optimized for cost
Remote on/off
Undervoltage lockout (UVLO)
Over current and short circuit protection
Remote sense
Description
The Bel S7DB-12B modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 5V
source. These converters are available in a range of output voltages from 1.2V to 3.3V. They are packaged in a compact, low
profile, surface mount DIP package for ease of layout and space savings. 12A maximum output is also provided. Standard
features include remote on/off, remote sense, over current and short circuit protection, UVLO and output voltage adjust.
These products may be used almost anywhere low voltage silicon is employed and a 5V source is available. Typical applica-
tions include file servers, routers, line cards and other computing and communications equipment.
Applications
page 1
S7DB-12B Series
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 2
Input Specifications
Absolute Maximum Ratings
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC
converter or may permanently damage the device.
Note: Input capacitance two 270F/10V, ESR = 0.018
max at 100kHz @ 25 C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 5V, Iout = full load, Ta = 25 C.
2. 0 - 20MHz, 1F ceramic cap and 10F aluminum cap on output.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 4
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 5
Control Specifications
General Specifications
1. Vin=5V, full load and Ta=25 C.
2. See graphs on pages 10-12.
3. With remote on/off pin 8 open, the module is on.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 6
Efficiency Data
Module 3.3V
90%
91%
92%
93%
94%
95%
96%
97%
98%
1
2
3
4
5
6
7
8
9 10 11 12 13
Output Current
Effi
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4.5V
5.0V
5.5V
Module 2.5V
87%
88%
89%
90%
91%
92%
93%
94%
95%
96%
97%
1
2
3
4
5
6
7
8
9
10 11 12 13
Output Current
E
ffi
c
i
e
n
c
y
4.5V
5.0V
5.5V
Module 1.8V
83%
84%
85%
86%
87%
88%
89%
90%
91%
92%
93%
94%
95%
1
2
3
4
5
6
7
8
9 10 11 12 13
Output Current
E
f
f
i
c
i
enc
y
4.5V
5.0V
5.5V
Module 1.5V
82%
84%
86%
88%
90%
92%
94%
1
2
3
4
5
6
7
8
9 10 11 12 13
Output Current
E
ffi
c
i
e
n
c
y
4.5V
5.0V
5.5V
Module 1.2V
79%
81%
83%
85%
87%
89%
91%
93%
1
2
3
4
5
6
7
8
9 10 11 12 13
Output Current
E
f
fi
ci
e
n
cy
4.5V
5.0V
5.5V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 7
Ripple and Noise
Ripple and noise at full load and 5Vdc input,
3.3Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input,
2.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input,
1.8Vdc output and Ta=25 C
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
Ripple and noise at full load and 5Vdc input,
1.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input,
1.2Vdc output and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 8
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=3.3V
50% to 100% load transients at 5V input and Ta=25 C
Vout=3.3V
100% to 50% load transients at 5V input and Ta=25 C
Vout=2.5V
50% to 100% load transients at 5V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 5V input and Ta=25 C
Vout=1.8V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.8V
100% to 50% load transients at 5V input and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 9
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=1.2V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.5V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 5V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 5V input and Ta=25 C
Thermal Considerations
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 10
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Output Voltage Set-Point Adjustment
S7DB-12B330 Trim Resistor Calculation
2.97
3
3.04 3.07
3.1
3.13 3.17
3.2
3.23 3.27
3.3
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
R
t
r
i
m
_
dow
n
(
K
o
hm
)
3.3
3.33 3.37
3.4
3.43 3.46
3.5
3.53 3.56
3.6
3.63
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
,
R
t
r
i
m
_
up(
K
ohm
)
Kohm
adj
Vo
Vo
R
down
trim
)
82
.
6
,
964
.
7
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
65
.
3
,
536
.
2
(
_
-
-
=
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.312V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.312V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 11
S7DB-12B250 Trim Resistor Calculation
S7DB-12B180 Trim Resistor Calculation
Output Voltage Set-Point Adjustment
2.25 2.27
2.3
2.33
2.35
2.38
2.4
2.42
2.45
2.48
2.5
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
2.5
2.52
2.55
2.58
2.6
2.63
2.65
2.67
2.7
2.73
2.75
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or v
a
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Kohm
adj
Vo
Vo
R
down
trim
)
8
.
6
,
691
.
3
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
64
.
4
,
728
.
1
(
_
-
-
=
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.509V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.509V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
1.62 1.64 1.66 1.67 1.69 1.71 1.73 1.75 1.76 1.78
1.8
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
1.8
1.82 1.84
1.85 1.87 1.89
1.91 1.93
1.94 1.96 1.98
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or v
a
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Kohm
adj
Vo
Vo
R
down
trim
)
84
.
13
,
869
.
3
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
10
,
072
.
3
(
_
-
-
=
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.808V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.808V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 12
S7DB-12B150 Trim Resistor Calculation
S7DB-12B120 Trim Resistor Calculation
Output Voltage Set-Point Adjustment
1.35 1.37 1.38
1.4
1.41 1.43 1.44 1.46 1.47 1.49
1.5
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
1.5
1.51
1.53
1.54
1.56
1.58
1.59
1.61
1.62
1.64
1.65
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or v
a
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Kohm
adj
Vo
Vo
R
down
trim
)
71
.
11
,
716
.
2
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
87
.
7
,
072
.
3
(
_
-
-
=
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.507V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.507V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
where,
1.08 1.09
1.1
1.12 1.13 1.14 1.15 1.16 1.18 1.19
1.2
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
Rt
ri
m
_dow
n(K
ohm
)
1.2
1.21 1.22
1.24 1.25
1.26 1.27 1.28
1.3
1.31
1.32
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or v
a
l
u
e
,Rt
ri
m
_up
(K
ohm
)
Kohm
adj
Vo
Vo
R
down
trim
)
48
.
8
,
562
.
1
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
64
.
4
,
072
.
3
(
_
-
-
=
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.207V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.207V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
where,
CORPORATE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel
201-432-0463
Fax
201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel
852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel
44-1772-556601
Fax 44-1772-888366
www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-12B
5V Input / 1.2V 3.3V Output / 12A
page 13
Mechanical
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
1.22 [30.99]
0.394 [10.01]
0.67
[17.00]
0.985 [25.02]
5X
0.197
[5.00]
6X
0.102
[2.59]
0.345
[8.76]
0.010
[0.25]
0.827
[21.01]
2X 0.050 [1.27]
2X 0.079 [1.99]
0.004 [0.10]
0- 5
0.100
[2.54]
0.120 [3.05]
0.197 [5.00]
0.895
[22.73]
Suggested PCB Pad Layout
1
2
3
4
5
6
12 11 10
9
8
7
n
i
P
n
o
i
t
c
n
u
F
1
d
n
u
o
r
G
2
d
n
u
o
r
G
3
d
n
u
o
r
G
4
d
n
u
o
r
G
5
n
i
V
+
6
n
i
V
+
7
m
i
r
T
8
f
f
O
/
n
O
e
t
o
m
e
R
9
)
+
(
e
s
n
e
S
e
t
o
m
e
R
0
1
o
V
+
1
1
o
V
+
2
1
o
V
+
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